I love how Nina considers Riawna a best friend, and she's her hair stylist too. I love how Nina seems to become close with the people she works with or people that work for her. Erica was her personal assistant someone said in another thread, and they ended up becoming really close friends too. Working with/for Nina must be awesome, as I'm sure she treats people really well since they always seem to become good friends with her.

On a side note I think Riawna is the one who introduced Nina and Julianne Hough.